My 16 year old cat, and my 2 year old love to play together, but the 16 year old was moving a little slow and sluggish. Now the 16 year old is picking it up with his end of their play time together, and is enjoying his time with the 2 year old. I am a happy kitty mom again. I am glad I have found Nu-Cat SENIOR Multi Vitamin/Mineral as my cat's vet suggested it as a supplement I have added to his regular diet now.